Technical Drivers Side Brake Light Out

[Fiat Punto 2012 GBT]

A yellow warning light came on the dash and I figured out the drivers side brake light was out. I opened the light casing and the bulb had blown, but when I've tried 2 new bulbs it still doesn't work (neither new ones blew). The indicator in the casing still works and also like auxiliary brake lights surrounding the main bulb (LEDs I think).

I've checked the fuses and all are ok. I didn't really see any corrosion on the bulb socket but I'm going to try to clean it later with some alcohol.

Has anyone had the same issue?

Thanks

 

[puntodad19]

The lad had a similar problem, just like a bad earth, where all lights apart to on the led sidelights.

Turned out the earth track in the lamp unit was a *make and break occasional bad connection where the earth track is *plastic rivetted* to the light unit.

We made a dedicated "extra earth" wire from a convienient existing hole in the body, behind the rear trim, bullet connection to aid easy light unit removal, and soldered the wire to a convienient location on the bulbs side ( after the occasional bad earth plastic rivet ) of the earth track.

A few months later the n/s light unit needef the same *fix*.

This, along with attending to the n/s earth point, which we reckon was ok, has cured the occasion dash ' light not working' warning, touch wood.

You know of e par which is handy for the exploded views, and e learn for tech into. Both can be viewed from this forum.

2010 Punto Evo active/feelin good 1.2. 8v. 68bhp model.

 

[Fiat Punto 2012 GBT]

Thanks for the input Puntodad. I'll have to study your comment and confer with a friend as that honestly goes over my head haha.

I've just cleaned the contacts (they were spotless to begin with). I then tried a multi-meter and got a constant 5 - 5.5v from the brake socket (brake engaged or not). I also measured the indicator socket for reference and I got 0v disengaged and around 10v engaged.

Does that support your earth theory do you know puntodad?

Thanks.

​

 

[puntodad19]

You have a dmm, check continuiy and resistance across the plastic rivetted earth track. By the sound of things, it will be fine on the loom plug side of the earth track, ( subject to the light units pins and loom plug pins being ok ) but may be *iffy* on the earth track on the other side of the plastic rivet which is heat distorted, on the rather narrow bit of earth track and the rivets hole thru the earth track. This is why we fitted the extra dedicated earth wire

Be extremely carefull using test meters, as some power feeds to the lights may arrive via the bcm.

Digital multi meters are high impedance, being much safer.

Post a good none fuzzy picture of the light unit pins and tracks.

Over.....